The letter right after $\subset$.
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It is a \mathscr{S}
\documentclass[12pt, border=2pt]{standalone}
\usepackage{mathrsfs}
\begin{document}
$\{T_n\}_{n=1}^{\infty}\subseteq\mathscr{S}_a$
\end{document}
marsupilam
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mathrsfs. Load the package and use\mathscr{S}. – Bernard May 21 '17 at 16:22\usepackage{fouriernc}, in document$\mathcal{S}$– Zarko May 21 '17 at 16:22